An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
Mont Blanc massif in the Alps, France.Â© Index Open. Scientists P. Martel in 1742, Jean A. Deluc in 1770, and, later, Horace BÃ©nÃ©dict de Saussure first drew attention to Mont Blancâs distinction as western Europeâs highest mountain. That designation stirred adventurers to climb the peak.